1276
Model Conversion Instructions (Unit Ver. 3.0 or Later) Section 3-35
Description BCNTC(621) counts the total number of bits that are ON in all words between
S and S+(N–1) and places the BCD result in R.
Flags
Note In C-series PLCs, the BIT COUNTER (BITC) instruction will cause the Error
Flag to go ON if the content of an indirectly addressed DM word (*DM) is not
BCD, or the DM area boundary is exceeded. BCNTC(621) will not cause the
Error Flag to go ON in these cases.
Precautions An error will occur if N is not BCD between 0001 and 9999, or the result
exceeds 9,999.
Example When CIO 000000 is ON in the following example, BCNTC(621) counts the
total number of ON bits in the 10 words from CIO 0100 through CIO 0109 and
writes the result to D00100.
DM Area D00000 to D32767
EM Area without bank E00000 to E32767
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants #0001 to #9999
(BCD)
---
Data Registers DR0 to DR15 --- DR0 to DR15
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area N S R
S+(N–1)
R
to
N words
BCD result
Counts the number
of ON bits.
Name Label Operation
Error Flag ER ON if N is not within the range 0001 to 9999 BCD.
ON if result exceeds 9999 BCD.
OFF in all other cases.
Equals Flag = ON if the result is 0000.
OFF in all other cases.
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